CN111341998A - Pole piece containing coloring insulating coating and lithium ion battery - Google Patents

Pole piece containing coloring insulating coating and lithium ion battery Download PDF

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Publication number
CN111341998A
CN111341998A CN202010157248.4A CN202010157248A CN111341998A CN 111341998 A CN111341998 A CN 111341998A CN 202010157248 A CN202010157248 A CN 202010157248A CN 111341998 A CN111341998 A CN 111341998A
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Prior art keywords
insulating coating
pole piece
battery
colorant
coating
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CN111341998B (en
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任卫强
张敏
申津靖
高秀玲
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)

Abstract

The invention creates a pole piece containing a coloring insulating coating and a lithium ion battery, wherein the pole piece comprises a current collector, an active layer and an insulating coating, and the insulating coating comprises the following components in percentage by mass: 70% -90% of a colorant; 5% -20% of inorganic particles; 5 to 10 percent of binder. According to the technical scheme, the energy density of the battery cell can be improved, the risk of internal short circuit is reduced, the resolution precision of a video identification system on the edge of the pole piece is improved, the yield of the die cutting procedure of the pole piece is improved, and the service life of a die cutting tool is prolonged; the coating has lower volume density, is beneficial to improving the energy density of a battery system, reducing the risk of internal short circuit, improving the safety performance of a battery product, improving the high-temperature storage performance of the battery and prolonging the cycle life of a battery cell product.

Description

Pole piece containing coloring insulating coating and lithium ion battery
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a pole piece comprising a coloring insulating coating and a lithium ion battery.
Background
With the expansion of the market scale of new energy automobiles, people have higher and higher requirements on long endurance and high safety performance of the new energy automobiles, and the requirements are realized through high energy density, long service life, high safety design and the like of a power lithium ion battery pack.
In the post-subsidy era, the market of power lithium ion batteries is competitive, the market demands for products with low cost, high energy density and high safety are more urgent, and the multiplying power performance, the safety and the long cycle life of the power lithium ion batteries are considered while the energy density of the batteries is improved. Therefore, to achieve the balance between low cost, high energy density and high safety, the improvement of product competitiveness lies in the optimization design of the structure and material application of the battery, and the improvement of yield in the production process is also very important.
Generally, in order to improve the safety performance of the battery cell product, a ceramic coating can be coated on the surface of a diaphragm, a safety coating can be coated on the surface of a pole piece, an insulating coating can be coated on the edge of the pole piece, or a coating current collector with PTC characteristics can be adopted. The mode that the edge or the surface of the pole piece is coated with the insulating coating can reduce and prevent the risk of internal short circuit under extreme conditions, improve the safety performance of a battery product, reduce the self-discharge of the battery and prolong the cycle life.
The traditional technology for coating the insulating coating on the edge of the pole piece and the surface of the pole piece is to adopt ceramic materials for coating, the coating has higher hardness, the loss of a die cutting tool is large, and the service life of the tool is shortened; the coating has large volume density which is usually more than or equal to 1.3g/cm3, and the reduction of the specific gravity of the coating becomes a necessary technical means under the market trend of improving the energy density of the battery; the boundary line resolution of the insulating coating and the active layer is not accurate enough by a video recognition system of the pole piece die cutting process, so that the die cutting size reject ratio of the pole piece is high.
Disclosure of Invention
In order to overcome the problems in the background art, the invention aims to provide a pole piece comprising a coloring insulating coating, which can improve the energy density of a battery cell, reduce the risk of internal short circuit, improve the resolution precision of a video identification system on the edge of the pole piece, improve the yield of the die cutting procedure of the pole piece and prolong the service life of a die cutting cutter; the coating has lower volume density, is beneficial to improving the energy density of a battery system, reducing the risk of internal short circuit, improving the safety performance of a battery product, improving the high-temperature storage performance of the battery and prolonging the cycle life of a battery cell product.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a pole piece comprising a coloring insulating coating, which comprises a current collector, an active layer coated on the surface of the current collector, and an insulating coating coated on the edge of the current collector and/or the surface of the active layer, wherein the insulating coating comprises the following components in percentage by mass:
name of Material Composition ratio
Coloring agent X1＝70％-90％
Inorganic particles X2＝5％-20％
Binder X3＝5％-10％
The proportion of each component satisfies the following relation:
X1+X2+X3＝1 (1)
the proportion of each component of the insulating coating satisfies the following relation:
X1+3.5*X2+X3≤1.5 (2)
if (X)1+3.5*X2+X3) If the sum of the total density and the thickness of the insulating layer exceeds 1.5, the volume density of the insulating layer exceeds 1.1g/cm3It is not in accordance with the spirit of the present invention to increase the energy density.
The colorant has a particle size D50 of 0.5-5 μm and a specific surface area S1＝10-15㎡/g；
The inorganic particles have a particle size distribution D50 of 0.5-2.0 μm and a specific surface area S2＝2.0-6.0㎡/g；
The positive active substance is one or more of NCM622, NCM712, NCM811, NCA and LFP materials;
the negative active substance is one or more of graphite, hard carbon, mesocarbon microbeads and silicon carbon materials;
the active material layer has a coating width D0The part of the width of the insulating coating layer which exceeds the width of the active layer is D1Satisfies the following relationship 0.01D0≤D1≤0.1D0；
The active layer thickness h110-90 μm, preferably 20-80 μm;
the coating thickness h of the insulating coating21-50 μm, preferably 3-40 μm;
the specific surface area S of the active particles0＝0.5-2.0m2/g；
The specific surface area of each component satisfies the following relationship:
12*S0≤X1*S1+X2*S2≤22*S0(3)
if (X)1*S1+X2*S2) Values below 12S0The insulating layer has no obvious advantages on the effects of improving the liquid retention capacity, the storage performance and the cycle performance of the battery, and if the insulating layer exceeds 22S0And the viscosity of the slurry is increased, the processing difficulty is increased, and the scheme is out of feasibility.
Preferably, the color of the insulating coating is yellow or red, and the color is obtained by independently using or compounding toners with different colors.
Preferably, the inorganic particles in the insulating coating are at least one of alumina, boehmite, titania, calcium carbonate, zirconia, and silica;
preferably, the colorant pigment in the insulating coating, such as a yellow colorant, is a quinophthalone compound pigment, the red colorant is a diketopyrrolopyrrole pigment, and the molecular structure contains more cyclic structures, so that free alkaline earth metal and transition metal ions can be captured to form a complex structure. When the battery core is in extreme conditions such as high temperature, metals such as Mn, Ni and Co can be separated out from the high-nickel anode material and deposited on the surface of the negative electrode, the SEI film is damaged, irreversible attenuation is caused to the capacity of the battery, the colorant pigment exists in the insulating coating and can adsorb the free metal ions and the metal deposits, so that the metal dissolved matters are prevented from being deposited on the surface of the negative electrode, the damage to the SEI film is reduced, the high-temperature storage performance of the battery can be improved, and the cycle life is prolonged.
Preferably, the coloring agent is an organic compound component, has lower hardness than the ceramic material, and can reduce the abrasion to the die cutting tool, thereby prolonging the service life of the tool and reducing the loss.
Preferably, the conductivity of the colorant is less than 200 mu S/cm, the colorant is an insulating material and is electrochemically inert, and 2.5-4.5v-CV scanning does not have electrochemical activity and does not participate in electrochemical reaction in a battery system;
the melting point of the colorant is preferably more than or equal to 250 ℃, the high melting point of the colorant can ensure that the insulating coating can still isolate the positive electrode and the negative electrode when the battery is charged and discharged with large current, or the battery core works in a high-temperature environment, or even extremely, the diaphragm shrinks, so that short circuit between the positive electrode and the negative electrode caused by the shrinkage of the diaphragm is avoided, and the safety performance of the battery is improved.
Preferably, the granularity D50 of the colorant is 0.5 to 5 mu m, and the specific surface area is 10 to 50 square meters per gram; the organic polycyclic molecular structure has a physical adsorption effect on organic side reaction products, metal ions and other by-products, micro impurities and the like in the battery, so that the deposition of the by-products on the surface of the positive electrode and the surface of the negative electrode is reduced, the damage effect on an SEI film of the electrode is reduced, and the performances of the battery such as high-temperature storage performance, cycle life and the like are improved.
Preferably, the binder is one or more of polyacrylate, PVDF, CMC and SBR;
preferably, the volume density of the insulating coating is less than or equal to 1.1g/cm3(ii) a Has lower density than the traditional ceramic coating, and is beneficial to improving the energy density of the cell.
Preferably, the color difference △ E between the insulating coating and the aluminum foil, between the insulating coating and the copper foil, between the insulating coating and the anode active material layer, and between the insulating coating and the cathode active material layer is not less than 10, so that the coating boundary or boundary can be accurately identified by the video identification system, the size yield of the die cutting process is ensured, and if the color difference is less than 10, the identification of the coating boundary or boundary by the video identification system is not facilitated, and the yield is reduced.
In another aspect of the invention, a battery is provided, which comprises a positive pole piece coated with the insulating coating and/or a negative pole piece coated with the insulating coating.
The beneficial effects created by the invention are as follows:
(1) the boundary of the pole piece is clear, the color distinction is obvious, the video recognition system can more accurately recognize the boundary of the pole piece in the die cutting process, and the yield of the die cutting process is improved;
(2) the safety performance of a battery cell product prepared by the pole piece with the insulating coating, such as needling, extrusion, heating, overcharging and the like, is improved;
(3) compared with the traditional ceramic coating, the colored insulating coating reduces the abrasion to the die cutting tool and prolongs the service life of the tool;
(4) the coating has lower volume density, and is beneficial to improving the energy density of the battery cell;
(5) the battery core prepared by the pole piece containing the insulating coating has better high-temperature storage performance and can prolong the cycle life of the battery.
Drawings
FIG. 1 is a schematic cross-sectional view of a positive/negative electrode plate fully covered with a colored insulating coating;
FIG. 2 is a schematic top view of a colored insulating coating applied to the surface and edges of an active layer;
fig. 3 is a schematic top view of a colored insulating coating applied to the edge of a current collector.
In the figure: 1. positive/negative current collectors; 2. a positive/negative electrode active material layer; 3. and a positive/negative electrode insulating coating.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
Electrochemical system design of battery
1. In the examples and the comparative examples of the present invention, the positive electrode was made of NCM622, and was applied to the surface of aluminum foil by homogenization and rolling for later use. And the negative electrode adopts a graphite material system, is homogenated and coated on the surface of the copper foil, and is rolled for later use. The electrochemical design adopts the same scheme;
2. in the embodiment and the comparative example, the diaphragm adopts a PE diaphragm coated with ceramic coatings on two sides, and the electrolyte is a commercial product of the same type of Jinniu 1512 electrolyte;
3. and manufacturing the battery cell by adopting the positive plate and the negative plate coated with the coloring insulating coating.
Secondly, the battery manufacturing steps are as follows:
step 1: preparing a negative plate, mixing materials, homogenizing, coating on the surface of an active layer of a negative current collector, wherein the thickness is 8 mu m, and baking for later use;
step 2: preparing a positive plate, mixing materials, homogenizing, coating on the surface of an active layer of a positive current collector, wherein the thickness is 8 mu m, and baking for later use;
step 3: preparing materials such as a ceramic diaphragm, electrolyte, an aluminum plastic film and the like coated on two sides;
step 4: preparing an electric core:
the positive plate, the negative plate, the diaphragm, the electrolyte and the like are adopted, and the electric core is obtained after the working procedures of punching, laminating, welding, assembling and injecting, pre-charging, formation, degass, aging and the like, and is subjected to electric performance test analysis.
The pole pieces without the insulating coating are numbered as follows:
positive electrode tab C0: a positive plate without an insulating coating;
negative electrode sheet a 0: and the negative plate is not provided with an insulating coating.
Example 1
Preparing the negative plate, and using the negative material with specific surface area S0＝0.89m2/g；
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Quinophthalone compound pigments X1＝70
Alumina oxide X2＝20
PVDF X3＝10
Wherein, X1+3.5*X2+X3＝1.5
Specific surface area S of alumina2＝5.8m2G, specific surface area of colorant S1＝15m2/g；
Wherein X1*S1+X2*S211.66, the following relationship is satisfied:
12*0.89≤X1*S1+X2*S2≤22*0.89
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the negative active layer, wherein the edge of the insulating coating slurry exceeds the width D of the active layer1＝0.06D0And coating the mixture to a thickness of 3 mu m to obtain a negative plate A1, combining the negative plate A1 with a positive plate C0, and preparing the lithium ion battery according to the battery core preparation steps.
Example 2
Preparing the negative plate, and using the negative material with specific surface area S0＝0.89m2/g；
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Quinophthalone compound pigments X1＝75
Alumina oxide X2＝15
PVDF X3＝10
Wherein, X1+3.5*X2+X3＝1.375
Specific surface area S of alumina2＝5.8m2G, specific surface area of colorant S1＝15m2/g；
Wherein X1*S1+X2*S212.12, the following relationship is satisfied:
12*0.89≤X1*S1+X2*S2≤22*0.89
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the negative active layer, wherein the edge of the insulating coating slurry exceeds the width D of the active layer1＝0.08D0Coating ofThe thickness is 8 μm, and a negative plate A2 is obtained and is combined with a C0 positive plate, and the lithium ion battery is manufactured according to the battery core preparation steps.
Example 3
Preparing the negative plate, and using the negative material with specific surface area S0＝0.89m2/g；
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Quinophthalone compound pigments X1＝80
Alumina oxide X2＝10
PVDF X3＝10
Wherein, X1+3.5*X2+X3＝1.25
Specific surface area S of alumina2＝5.8m2G, specific surface area of colorant S1＝15m2/g；
Wherein X1*S1+X2*S212.58, the following relationship is satisfied:
12*0.89≤X1*S1+X2*S2≤22*0.89
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the negative active layer, wherein the edge of the insulating coating slurry exceeds the width D of the active layer1＝0.06D0The coating thickness was 6 μm,and (4) obtaining a negative plate A3, combining the negative plate A3 with a C0 positive plate, and manufacturing the lithium ion battery according to the battery cell preparation steps.
Example 4
Preparing positive plate, and using positive material with specific surface area S0＝0.67m2/g
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Quinophthalone compound pigments X1＝80
Boehmite (BO) X2＝15
PVDF X3＝5
Wherein, X1+3.5*X2+X3＝1.375
Boehmite specific surface area S2＝4.1m2G, specific surface area of colorant S1＝15m2/g；
Wherein X1*S1+X2*S212.615, the following relationship holds:
12*0.67≤X1*S1+X2*S2≤22*0.67
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the positive active layer, wherein the edge of the insulating coating slurry exceeds the width D of the active layer1＝0.04D0Coating thickness was 3 μm to obtain a positive electrode sheet C1And combining with the A0 negative plate to manufacture the lithium ion battery according to the battery core preparation steps.
Example 5
Preparing positive plate, and using positive material with specific surface area S0＝0.67m2/g
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Diketopyrrolopyrrole pigments X1＝85
Boehmite (BO) X2＝10
Polyacrylate X3＝5
Wherein, X1+3.5*X2+X3＝1.25
Boehmite specific surface area S2＝4.1m2G, specific surface area of colorant S1＝11m2/g；
Wherein X1*S1+X2*S29.76, the following relationship is satisfied:
12*0.67≤X1*S1+X2*S2≤22*0.67
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the active layer of the positive current collector, wherein the edge of the insulating coating slurry exceeds the width D of the active material area of the positive electrode1＝0.02D0Coating thickness of 6 μm to obtainAnd (3) combining the positive plate C2 with the A0 negative plate, and manufacturing the lithium ion battery according to the battery core preparation steps.
Example 6
Preparing positive plate, and using positive material with specific surface area S0＝0.67m2/g
The pigmented insulating coating was designed as follows:
name of Material The composition is proportioned
Quinophthalone compound pigments X1＝90
Boehmite (BO) X2＝5
Polyacrylate X3＝5
Wherein, X1+3.5*X2+X3＝1.125
Boehmite specific surface area S2＝4.1m2G, specific surface area of colorant S1＝15m2/g；
Wherein X1*S1+X2*S213.705, the following relationship holds:
12*0.67≤X1*S1+X2*S2≤22*0.67
preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the edge of the positive plate with the coating width D1＝0.08D0Coating thickness of 40 μm to obtain positive plate C3, combining with A0 negative plate,and manufacturing the lithium ion battery according to the battery core preparation steps.
Comparative example 1
And (3) combining the positive plate C0 and the negative plate A0 to manufacture the lithium ion battery according to the battery core preparation steps.
Comparative example 2
The insulating coating is designed as follows:
name of Material The composition is proportioned
Alumina oxide 95
PVDF 5
Preparing insulating coating slurry according to the proportion, coating the insulating coating slurry on the surface of the active layer of the negative current collector to obtain a negative plate A01 with the coating thickness of 40 mu m, combining the negative plate A01 with a C0 positive plate, and manufacturing the lithium ion battery according to the battery core preparation steps.
The pole piece yield and cell performance testing method comprises the following steps:
(1) the yield of the die cutting process of the pole piece containing the insulating coating is as follows:
counting the input quantity of the pole pieces before die cutting, and calculating the theoretical number N of the pole pieces obtained after die cutting0And counting the number of the pole pieces after the die cutting is finished to be N1And counting the yield R of more than 6 batchesMAnd averaging to evaluate the yield of the die cutting process. A method for calculating the yield of a certain batch comprises the following steps:
R＝N1/N0*100％
(2) and (3) testing the cycle performance:
the lithium ion batteries prepared in the examples and comparative examples were charged at a rate of 1C and charged at a rate of 1C in an environment of 45 deg.C
Discharging with multiplying power, performing full-charge discharge cycle test until the capacity of the lithium ion battery is less than 80% of the initial capacity,
the number of cycles was recorded.
(3) Storage performance:
charging the battery cell to 100% SOC with 1C constant current and constant voltage, storing the full-charge battery cell in a 55 ℃ environment for standing for 7 days, testing the capacity change before and after storage, and storing:
capacity retention rate (capacity after storage/capacity before storage) × 100%;
(4) and (3) heating test:
placing the test cell into a temperature box, and heating under the following conditions:
(a) a lithium ion battery monomer: the temperature box is increased from the test environment temperature to 130 +/-2 ℃ at the speed of 5 ℃/min, and the heating is stopped after the temperature is maintained for 30 min.
(b) After the test is finished, the test should be observed for 1h at the test environment temperature.
(5) And (3) needle punching test:
fully charging the battery in a standard 1C constant-current constant-voltage charging mode, standing for 1 hour, vertically penetrating the center of the battery cell (a steel needle stays in the battery cell for 300 seconds) at a speed of 25mm/s by using a high-temperature-resistant steel nail with the diameter of 5mm, monitoring the surface temperature and the voltage of the battery, observing whether the battery is on fire or exploded, and judging whether the battery is on fire or not;
TABLE 1 test results of examples 1-6 and comparative examples 1-2
Figure BDA0002404510850000091
As can be seen from table 1, in examples 1 to 6, the colored insulating coating is coated on the surface of the pole piece, and due to the presence of the colored insulating coating, the die-cutting yield of the pole piece is improved, and meanwhile, the insulating coating can play a role in capturing metal ions and adsorbing reaction byproducts. The insulating property of the coloring insulating coating improves the performance of a heating test and a needling test of the battery, and improves the safety performance of a battery product.
The above description is for the purpose of describing particular embodiments of the present invention, but the present invention is not limited to the particular embodiments described herein. All equivalent changes and modifications made within the scope of the invention shall fall within the scope of the patent coverage of the invention.

Claims (10)

1. A pole piece comprising a colored insulating coating comprising a current collector, an active layer and an insulating coating,
the insulating coating comprises the following components in percentage by mass:
colorant X1＝70％-90％；
Inorganic particle X2＝5％-20％；
Binder X3＝5％-10％。
The proportion of each component satisfies the following relation:
X1+X2+X3＝1 (1)
the proportion of each component of the insulating coating satisfies the following relation:
X1+3.5*X2+X3≤1.5 (2)。
2. a pole piece comprising a colored insulating coating according to claim 1, wherein said insulating coating is applied at a thickness h21-50 μm, preferably 3-40 μm.
3. The electrode sheet comprising a colored insulating coating according to claim 1, wherein the insulating coating has a bulk density of 1.1g/cm or less3。
4. The electrode sheet comprising a colored insulating coating according to claim 1, wherein the color difference △ E between the insulating coating and the aluminum foil, the insulating coating and the copper foil, and the insulating coating and the active layer of the active layer is greater than or equal to 10.
5. A pole piece comprising a pigmented insulating coating according to claim 1 wherein said colorant has a particle size distribution D50 of 0.5 to 5 μm and a specific surface area S1＝10-15㎡/g。
6. A pole piece comprising a pigmented insulating coating according to claim 1, wherein said inorganic particles have a particle size distribution D50 of 0.5-2.0 μm and a specific surface area S2＝2.0-6.0㎡/g。
7. A pole piece comprising a pigmented insulating coating according to claim 1 wherein said colorant is one or both of a yellow colorant quinophthalone compound pigment, a red colorant diketopyrrolopyrrole pigment.
8. A pole piece comprising a colored insulative coating of claim 1, wherein the inorganic particles in the insulative coating are at least one of alumina, boehmite, titania, calcium carbonate, zirconia, silica.
9. The pole piece comprising a colored insulating coating according to claim 1, wherein the binder is one or more of polyacrylate, PVDF, CMC, SBR.
10. The lithium ion battery is characterized by comprising a positive pole piece coated with the insulating coating and/or a negative pole piece coated with the insulating coating.
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